Gaya APA

Ratcliff, R. (2006). Delusions of Intelligence: Enigma, Ultra, and the End of Secure Ciphers . Cambridge: Cambridge University Press.

Gaya MLA

Ratcliff, R.A.. "Delusions of Intelligence: Enigma, Ultra, and the End of Secure Ciphers". Cambridge: Cambridge University Press, 2006. Buku.